Filter.



110.734.890, 1: PATENTED JULY 28, 1903. E. M. KNIGHT.

,No MODEL.

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` @www t UNITED STATES Patented Juy es, leo.

DWARD'MARTIN KNIGHT, or BROQKLYN, NEW YoRK, AssIGNoR or oNE- HALFToRL H.MARTIN, or NEW YORK, N. Y.

FILTR.

SECIFICATION forming part of Letters Patent No. 734,890, dated July 28,1903. l Application filed April 16, l903. Serial No. 152,954. (Nomodel.)

To all whom t may concern/.-

Be it, known that I, EDWARD `MARTIN KNIGHT, a citizen of the UnitedStates, residing at Brooklyn, in the county of Kings and State of NewYork, have invented'new and useful Improvements in Filters, of which the`following is a specication. f

This" invention relates to lters generally,

and particularly to that class designed for 1o ltering water fordomestic purposes and employing a filter-bed `composed of fibers of as,

Y bestos, compressed to form a pad or diaphragm, which is the medium forremoving the sedimentary or suspended matter from t5 Jthe water; and theinvention consists of the parts andthe constructions and combinations`of parts which I will hereinafter describe and claim.

Referring to the accompanying drawings,

:zowhich form a part of this specification, in`

which similarcharacters of reference indicate like parts throughout theseveral views, Figure l represents a sectional perspective View of alter embodying my invention. Figs. 2` y z5 and 3 are sectional views ofother type of fil-` ters, showing the salient features of. my infvention. Figs. 4 and 5 are plan views of the filter ofFigs. 2 and 3 withthe exteriorcaps removed. Fig. 6 is an enlarged detail to be 3o referredto.

In carrying out my invention I preferto form the filter so that it shallhave the general shape of a relatively shallow disk, although I do notlimit it to this specific shape.

`The filter consists of, say, five essential parts-namely, a flangedbase portion A; a foraminous cap B, fitting said base; a fibrous pad ordiaphragm C, iixed to or over the cap a ring D of larger diameter thanthe cap and 4o tting around the same and Aserving as a setter for thefiltering-pad or diaphragm, and an exterior cap E, having a surroundingrim or iiange which incloses the cap, ring, and pad and `fits over theoutside of the iianged body portion.

Referring to Fig. l, it will be seen that the base portion A is of acircular form and is spun,stamped, or otherwise shaped to provide acircumferential groove a, bounded on 5o one side by a circumscribingflange a and on the other side by a'wall a". This wall is formed byupturning the edge of the baseplate to form a :flange a3, and said edgeis thence folded over or returned upon itself to form an exterior walla4, at the base of which is formed a bead a5. This form results fromspinning or forming a relatively deep groove a6 in the bottom of theplate. The bottom of the plate, which may be slightly concaved, ispierced to receive an outlet-pipe l0, to which 6o may be attached aflexible tube for drawing `ed, filtered water into a vessel or tank. B vway of illustration I show by dotted lines in Fig. l two superposedbuckets B11 B12, one of which (the upper) receives the water tobeltered, 65

While the other (the lower) serves as a receiver for filtered water. Inthe bottom of the upper bucket is made a hole to receive the outletpipel0 of the base-plate of the filter, which pipeinvthis'instance isthreaded and is en- 7o gaged by a suitable nut l2 and washer, where-`bythe filter isheld in position. The buckets may `of course be of anywell-known and Aappropriate character and are made of any suitable anddesired material, and theymay represent any'form of vesselsforcontaining unfiltered and filtered water, respectively.

5 Over the inner flange a', which rises from the ibase-plate and formsthe inner Wall of the groove or channel a, is closely iitted the an- 8onular flange c of the inner or foraminous cap y B, and over the cap isplaced a pad or dia- ;phragm C,of asbestos orother material, which ispreferably formed between dies and has a soft flexible edge and acompressed central portion, as described more in detail in a formerapplication iiled by me March 4, i903, Serial No. 146,123. This pad ordiaphragm has a diameter inexcessof thatof the foralninous cap C, sothat its surrounding edgepro- 9e jects sufciently to allow it to bepressed into and'substantially ill the groove or channel d, formed inthe inner face of the base-plate A.

In the present instance when the pad Uor diaphragm is placed upon theinner for-amil nous cap Bit is set and secured in position by means ofasubstantially Wide ring D, which has a diameter slightly greater thanthat of the cap B, whereby upon being placed in position upon the capand the superposed loo pad C the lower edge of the ring, which ispreferably beaded, as at l5, forces the soft edge of the pad ordiaphragm inward into the groove or channel a, and the surroundingflange of the ring circumferentially and tightly compresses the edge ofthe pad against the surrounding ange of the foraminous cap B, therebymakingajoint thatis proof against the leakage of unfiltered Water, andto assist in obtaining this important result the free edge of the pad,which is turned up and exposed between the outer wall of the ring andthe inner wall of the outer flange of the baseplate, may be tamped orotherwise compacted into the space therebetween. It will be observedthat the ring is but substantially a band encircling and tightlycompressing that portion of the pad between said band and the inner angea of the base-plate and between the lower edge of the band and thebottom of the groove or channel. It serves also, and primarily, to setthe fibrous pad, and the ring being open all of the central and activeportion of the pad is exposed, and the person applying the pad can seewhat he is doing, and if the pad should be upturned by setting itinposition this defect would be noticeable and proper attention given toit before the filter is pnt into operation.

To com plete the filter, I employ the exterior cover E, whosesurrounding flange e tits closely over the exterior of the flange awhichsurrounds the outer edge of' the base-plate, and thus covers andprotects and conceals the otherwise exposed edge of the fibrous pad. Theexterior cover has sufficient height above the pad to form achamber, andthe unfiltered water enters this chamber through perforations 1G, formedin the cover at a suitable point, say,in the surrounding flange, asshown in Fig. 1.

The exterior cap or cover E has a handle Fl to facilitate its removaland replacement, and through this handle is made a vent 17 for admissionof air.

In operation the filter is placed in position in a vessel, and the waterto be filtered is placed in the vessel and will pass into the chamber ofthe filter and thence percolate through the pad or filter-bed, giving upits impurities, and finally passing out of the discharge-tube and into avessel placed to receive the filtered Water.

In Fig. 2 I illustrate the present improvement in connection with asuction-filter of slightly-modified form designed to be iixedin anupright position vin a vessel for lateral filtration through oppositesides. This filterincludesa central member A', of suitable material,having a centrally-located inwardlyopening circumferential groove amantian inner chamber C415, said groove having leading from it atnbe18,through which ltered water may be drawn, while au air-Valve at 19 isprovided to admit air, and thus prevent the filter becoming air-bound.

. On opposite sides of the central member of the filter is formed anannular groove or channel-uff", corresponding to the one shown in Fig. 1and bounded by inner and outer flanges a7 a8. Over the inner end ofthese flanges is placed a close-fitting foraminous cap B3, upon whichthe pad of fibrous material C is placed, as described for Fig. 1,

and over this pad is placed a setter ring or.

The suction-filter of' Fig. 2 is designed to have an exterior cap orcover E', which lits over the outer flange aS of the central member A',as described for the exterior cover of Fig. l, and said cover E may beprovided with an interior chamber a9, with openings 20' for theadmission of unfiltered water, or the cover may be an imperforate one tobe removed from the lter when the filter is in use, and thus expose thepad to the direct action of' the water, as shown in Fig. 4.

In Fig. 3 I show a suction-filter of' thin disklike form designed to becarried in the pocket and useful for tourists, sportsmen,the navalandmilitary establishments, dto. In all its essentials it is like Figs.1 and 2 in that it has a circular disk forming abase-plate A3, with theinner and outer Iianges al@ all. Over the inner ange ctw is closelyfitted the foraminous cap B2, and over this is placed the pad ordiaphragm C2. A ring D2 is placed over and upon the pad and tightly andcircumferent-ially compresses the edge of the pad betweenv itssurrounding flange and theinner iiange am of the base-plate, asdescribed for the other forms, and an exterior cover F.2 is used andmade either perforate or imperforate, as described for the same cover ofFigs. 1 and 2, said cover fitting over the outer ange @20E thebase-plate. If the cover used is of the imperforate type, it is removedfrom the filter when the filter is in actual use to give free and directaccess of the Water to the brous pad, whose exposed surface is protectedby rods extending across the upper part of the setter-ring, as shown andas before described.

The pocket-filter has a valved air-vent 22 leading to its interiorchamber, and a suctiontube 23 leads from the discharge end of thischamber.

Each or any of the preceding forms of base plates or members may haveand preferably has the lower portion or base formed of its outercircumscribing iiange undercut, as at H, and connecting with the bottomof the annular groove which receives the setter-ring, as shown in Fig.6, and the bottom edge of the setter-ring may be and preferably isformed with a projecting lip I, which coacts ICO with said undercutportion to form a secure lock for'the edgeportion of the fibrous disk,for when the ring is forced into place its flange turns the edge of thepad into the groove and the projecting lip I crowds a part of the edgeofthe pad into the said undercut portion of the outer flange of the baseand forms a secure lock for the pad and prevents its slipping out ofproper position.

Having thus described my invention, what I claim as new, and desire tosecu re by Letters Patent, is

1. In a filter, the combination of an annularlychanneled base memberhaving a lil- `tered-water outlet; a foraminous cap supported upon thebase member; a pad supported upon the cap; and having such diameter thatit normally extends over the annular channel of the base member; a ringfitted over the cap and pad and engaging the portion of the padoverlying the annular 'chant nel of the base member and compressing thepad; and an exterior ca edge portion into the annular channel andagainst the bottom thereof, and exposing the p fitting the outside ofthe base member.

2. 4In a filter; the combination of an annularly-channeled base memberhaving a filtered-Water outlet,andhavinginnerand outer concentricflanges forming the walls of the channel; a foraminous cap closelyfitting the inner flange; a filtering medium placed upon said cap andhaving a greater diameter than the cap whereby its edge normallyprojects beyond the same and over the annular channel of the basemember; a ring of slightlygreater diameter than the cap and fitting overthe filtering medium and depressing the projecting edge portion thereofinto the channel of the base member and against the bottom thereof, andcircumferentially compressing the material against the standing wall oftheinner flange to form a tight joint, said ring open at the center toexpose the central portion of the filtering material.

3. In a filter, the combination of an annularly-channeled base memberhaving a filtered-water outlet,and having inner and outer concentricflanges forming the walls of said channel; a foraminous cap closelyfitting the inner ange; a pad of fibrous filtering material placed overthe cap said pad of greater diameter than the cap whereby its edgeprojects beyond the same and over the annular channel of the base memberwhen the padis placed in position; a ring of greater diameter than thecap and having its lower edge to engage the projecting edge of the padand force the same into contact with the bottom of the channel of thebase member, thereby setting the pad, said pad having its centralportion exposed through said setterring and said ring circumferentiallycompressing the turned portion of the pad against the wall of thechannel formed by the said inner flange; and a cover or exterior caphaving a circumferential flange to pass over the outside of the outerflange of the base member.

4. In a filter, the combination of an annularlychanneled base memberhaving a filtered-water outlet and inner and outer concentric flangesforming the walls of said channel; a foraminous cap fitting closely theinner flange; a pad of fibrous material over said cap and an open centerring for setting the pad in place said ring having its surroundingflange circumferentially compressing the pad against said inner flangeand having its lower edge pressing an extended edge portion of the padinto said channel; and au exterior cap inclosing the pad and ring andhaving its surrounding flange extending over the outside of the exteriorflange of the base member, said exterior cap having holes forming inletsfor unfiltered water.

5. In a lter,the combination ofa base member having concentricflangesforming a groove or channel between them; a foraminous cap seatedagainst one of said flanges; a pad of fibrous material over said cap;and a ring for setting the pad; said ring having a surrounding flange tocompress the pad circumferentially against the inner wall of the channeland said channel undercut in the opposite wall' to permit the ring toforce the fibrous material therein and form a lock for the pad.

6; In a lter the combination of a base memberhavingconcentricflangesformingagroove or channel between them; aforaminous cap fitting said inner flange; a pad of fibrous maferial oversaid cap; a ring for setting the pad and having its surrounding flangeto compress the pad circumferentially against the inner flange andhaving its. bottom edge to force the edge of the pad into the channelbetween the flanges said ring having a projecting toe-piece surroundingits lower edge.

7. In a filter, the combination of an annularly-channeled base member; aforaminous inner cap; a pad of brous material thereover andlying withinsaid channel; said channel undercut at one side; and a ring for settingthe pad said ring circumferentially compressing the pad and having aprojecting toe surrounding its lower edge and adapted to force the padmaterially into the undercut portion of the channel to make alock-joint.

In testimony whereof I have hereunto set my hand-in presence of twosubscribing wit-Y nesses.

EDWARD MARTIN KNIGHT'. Witnesses:

H. D. JAMESON, F. L. RAND.

IOO

